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SecondaryKeyCreator (Oracle - Berkeley DB Java API)
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<H2>
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com.sleepycat.db</FONT>
<BR>
Interface SecondaryKeyCreator</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../com/sleepycat/bind/serial/SerialSerialKeyCreator.html" title="class in com.sleepycat.bind.serial">SerialSerialKeyCreator</A>, <A HREF="../../../com/sleepycat/bind/serial/TupleSerialKeyCreator.html" title="class in com.sleepycat.bind.serial">TupleSerialKeyCreator</A>, <A HREF="../../../com/sleepycat/bind/serial/TupleSerialMarshalledKeyCreator.html" title="class in com.sleepycat.bind.serial">TupleSerialMarshalledKeyCreator</A>, <A HREF="../../../com/sleepycat/bind/tuple/TupleTupleKeyCreator.html" title="class in com.sleepycat.bind.tuple">TupleTupleKeyCreator</A>, <A HREF="../../../com/sleepycat/bind/tuple/TupleTupleMarshalledKeyCreator.html" title="class in com.sleepycat.bind.tuple">TupleTupleMarshalledKeyCreator</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public interface <B>SecondaryKeyCreator</B></DL>
</PRE>

<P>
The interface implemented for extracting single-valued secondary keys from
primary records.
<p>
The key creator object is specified by calling
<A HREF="../../../com/sleepycat/db/SecondaryConfig.html#setKeyCreator(com.sleepycat.db.SecondaryKeyCreator)"><CODE>SecondaryConfig.setKeyCreator</CODE></A>.
The secondary database configuration is specified when calling
<A HREF="../../../com/sleepycat/db/Environment.html#openSecondaryDatabase(com.sleepycat.db.Transaction, java.lang.String, java.lang.String, com.sleepycat.db.Database, com.sleepycat.db.SecondaryConfig)"><CODE>Environment.openSecondaryDatabase</CODE></A>.
<p>
For example:
<pre>
    class MyKeyCreator implements SecondaryKeyCreator {
        public boolean createSecondaryKey(SecondaryDatabase secondary,
                                            DatabaseEntry key,
                                            DatabaseEntry data,
                                            DatabaseEntry result)
            throws DatabaseException {
            //
            // DO HERE: Extract the secondary key from the primary key and
            // data, and set the secondary key into the result parameter.
            //
            return true;
        }
    }
    ...
    SecondaryConfig secConfig = new SecondaryConfig();
    secConfig.setKeyCreator(new MyKeyCreator());
    // Now pass secConfig to Environment.openSecondaryDatabase
</pre>
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<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/SecondaryKeyCreator.html#createSecondaryKey(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)">createSecondaryKey</A></B>(<A HREF="../../../com/sleepycat/db/SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</A>&nbsp;secondary,
                   <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;key,
                   <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;data,
                   <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;result)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a secondary key entry, given a primary key and data entry.</TD>
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<A NAME="createSecondaryKey(com.sleepycat.db.SecondaryDatabase, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry)"><!-- --></A><H3>
createSecondaryKey</H3>
<PRE>
boolean <B>createSecondaryKey</B>(<A HREF="../../../com/sleepycat/db/SecondaryDatabase.html" title="class in com.sleepycat.db">SecondaryDatabase</A>&nbsp;secondary,
                           <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;key,
                           <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;data,
                           <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A>&nbsp;result)
                           throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Creates a secondary key entry, given a primary key and data entry.
    <p>
    A secondary key may be derived from the primary key, primary data, or a
    combination of the primary key and data.  For secondary keys that are
    optional, the key creator method may return false and the key/data pair
    will not be indexed.  To ensure the integrity of a secondary database the
    key creator method must always return the same result for a given set of
    input parameters.
    <p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>secondary</CODE> - the database to which the secondary key will be added.
    This parameter is passed for informational purposes but is not commonly
    used.
    <p><DD><CODE>key</CODE> - the primary key entry.  This parameter must not be modified
    by this method.
    <p><DD><CODE>data</CODE> - the primary data entry.  This parameter must not be modified
    by this method.
    <p><DD><CODE>result</CODE> - the secondary key created by this method.
    <p>
<DT><B>Returns:</B><DD>true if a key was created, or false to indicate that the key is
    not present.
    <p>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if an error occurs attempting to create the
    secondary key.</DL>
</DD>
</DL>
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